<HTML>
<BODY BGCOLOR="white">
<PRE>
<FONT color="green">001</FONT>    // Copyright (c) 2011, Mike Samuel<a name="line.1"></a>
<FONT color="green">002</FONT>    // All rights reserved.<a name="line.2"></a>
<FONT color="green">003</FONT>    //<a name="line.3"></a>
<FONT color="green">004</FONT>    // Redistribution and use in source and binary forms, with or without<a name="line.4"></a>
<FONT color="green">005</FONT>    // modification, are permitted provided that the following conditions<a name="line.5"></a>
<FONT color="green">006</FONT>    // are met:<a name="line.6"></a>
<FONT color="green">007</FONT>    //<a name="line.7"></a>
<FONT color="green">008</FONT>    // Redistributions of source code must retain the above copyright<a name="line.8"></a>
<FONT color="green">009</FONT>    // notice, this list of conditions and the following disclaimer.<a name="line.9"></a>
<FONT color="green">010</FONT>    // Redistributions in binary form must reproduce the above copyright<a name="line.10"></a>
<FONT color="green">011</FONT>    // notice, this list of conditions and the following disclaimer in the<a name="line.11"></a>
<FONT color="green">012</FONT>    // documentation and/or other materials provided with the distribution.<a name="line.12"></a>
<FONT color="green">013</FONT>    // Neither the name of the OWASP nor the names of its contributors may<a name="line.13"></a>
<FONT color="green">014</FONT>    // be used to endorse or promote products derived from this software<a name="line.14"></a>
<FONT color="green">015</FONT>    // without specific prior written permission.<a name="line.15"></a>
<FONT color="green">016</FONT>    // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS<a name="line.16"></a>
<FONT color="green">017</FONT>    // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT<a name="line.17"></a>
<FONT color="green">018</FONT>    // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS<a name="line.18"></a>
<FONT color="green">019</FONT>    // FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE<a name="line.19"></a>
<FONT color="green">020</FONT>    // COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,<a name="line.20"></a>
<FONT color="green">021</FONT>    // INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,<a name="line.21"></a>
<FONT color="green">022</FONT>    // BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;<a name="line.22"></a>
<FONT color="green">023</FONT>    // LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER<a name="line.23"></a>
<FONT color="green">024</FONT>    // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT<a name="line.24"></a>
<FONT color="green">025</FONT>    // LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN<a name="line.25"></a>
<FONT color="green">026</FONT>    // ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE<a name="line.26"></a>
<FONT color="green">027</FONT>    // POSSIBILITY OF SUCH DAMAGE.<a name="line.27"></a>
<FONT color="green">028</FONT>    <a name="line.28"></a>
<FONT color="green">029</FONT>    package org.owasp.html;<a name="line.29"></a>
<FONT color="green">030</FONT>    <a name="line.30"></a>
<FONT color="green">031</FONT>    /**<a name="line.31"></a>
<FONT color="green">032</FONT>     * Pre-packaged HTML sanitizer policies.<a name="line.32"></a>
<FONT color="green">033</FONT>     *<a name="line.33"></a>
<FONT color="green">034</FONT>     * &lt;p&gt;<a name="line.34"></a>
<FONT color="green">035</FONT>     * These policies can be used to sanitize content.<a name="line.35"></a>
<FONT color="green">036</FONT>     * &lt;/p&gt;<a name="line.36"></a>
<FONT color="green">037</FONT>     * &lt;pre&gt;<a name="line.37"></a>
<FONT color="green">038</FONT>     *   Sanitizers.FORMATTING.sanitize({@code "&lt;b&gt;Hello, World!&lt;/b&gt;"})<a name="line.38"></a>
<FONT color="green">039</FONT>     * &lt;/pre&gt;<a name="line.39"></a>
<FONT color="green">040</FONT>     * and can be chained<a name="line.40"></a>
<FONT color="green">041</FONT>     * &lt;pre&gt;<a name="line.41"></a>
<FONT color="green">042</FONT>     *   PolicyFactory sanitizer = Sanitizers.FORMATTING.and(Sanitizers.BLOCKS);<a name="line.42"></a>
<FONT color="green">043</FONT>     *   System.out.println(sanitizer.sanitize({@code "&lt;p&gt;Hello, &lt;b&gt;World!&lt;/b&gt;"}));<a name="line.43"></a>
<FONT color="green">044</FONT>     * &lt;/pre&gt;<a name="line.44"></a>
<FONT color="green">045</FONT>     *<a name="line.45"></a>
<FONT color="green">046</FONT>     * &lt;p&gt;<a name="line.46"></a>
<FONT color="green">047</FONT>     * For more fine-grained control over sanitization, use<a name="line.47"></a>
<FONT color="green">048</FONT>     * {@link HtmlPolicyBuilder}.<a name="line.48"></a>
<FONT color="green">049</FONT>     * &lt;/p&gt;<a name="line.49"></a>
<FONT color="green">050</FONT>     *<a name="line.50"></a>
<FONT color="green">051</FONT>     * @author Mike Samuel &lt;mikesamuel@gmail.com&gt;<a name="line.51"></a>
<FONT color="green">052</FONT>     */<a name="line.52"></a>
<FONT color="green">053</FONT>    public final class Sanitizers {<a name="line.53"></a>
<FONT color="green">054</FONT>    <a name="line.54"></a>
<FONT color="green">055</FONT>      /**<a name="line.55"></a>
<FONT color="green">056</FONT>       * Allows common formatting elements including {@code &lt;b&gt;}, {@code &lt;i&gt;}, etc.<a name="line.56"></a>
<FONT color="green">057</FONT>       */<a name="line.57"></a>
<FONT color="green">058</FONT>      public static final PolicyFactory FORMATTING = new HtmlPolicyBuilder()<a name="line.58"></a>
<FONT color="green">059</FONT>          .allowCommonInlineFormattingElements().toFactory();<a name="line.59"></a>
<FONT color="green">060</FONT>    <a name="line.60"></a>
<FONT color="green">061</FONT>      /**<a name="line.61"></a>
<FONT color="green">062</FONT>       * Allows common block elements including &lt;code&gt;&amp;lt;p&amp;gt;&lt;/code&gt;,<a name="line.62"></a>
<FONT color="green">063</FONT>       * &lt;code&gt;&amp;lt;h1&amp;gt;&lt;/code&gt;, etc.<a name="line.63"></a>
<FONT color="green">064</FONT>       */<a name="line.64"></a>
<FONT color="green">065</FONT>      public static final PolicyFactory BLOCKS = new HtmlPolicyBuilder()<a name="line.65"></a>
<FONT color="green">066</FONT>          .allowCommonBlockElements().toFactory();<a name="line.66"></a>
<FONT color="green">067</FONT>    <a name="line.67"></a>
<FONT color="green">068</FONT>      /**<a name="line.68"></a>
<FONT color="green">069</FONT>       * Allows certain safe CSS properties in {@code style="..."} attributes.<a name="line.69"></a>
<FONT color="green">070</FONT>       */<a name="line.70"></a>
<FONT color="green">071</FONT>      public static final PolicyFactory STYLES = new HtmlPolicyBuilder()<a name="line.71"></a>
<FONT color="green">072</FONT>          .allowStyling().toFactory();<a name="line.72"></a>
<FONT color="green">073</FONT>    <a name="line.73"></a>
<FONT color="green">074</FONT>      /**<a name="line.74"></a>
<FONT color="green">075</FONT>       * Allows HTTP, HTTPS, MAILTO, and relative links.<a name="line.75"></a>
<FONT color="green">076</FONT>       */<a name="line.76"></a>
<FONT color="green">077</FONT>      public static final PolicyFactory LINKS = new HtmlPolicyBuilder()<a name="line.77"></a>
<FONT color="green">078</FONT>          .allowStandardUrlProtocols().allowElements("a")<a name="line.78"></a>
<FONT color="green">079</FONT>          .allowAttributes("href").onElements("a").requireRelNofollowOnLinks()<a name="line.79"></a>
<FONT color="green">080</FONT>          .toFactory();<a name="line.80"></a>
<FONT color="green">081</FONT>    <a name="line.81"></a>
<FONT color="green">082</FONT>      private static final AttributePolicy INTEGER = new AttributePolicy() {<a name="line.82"></a>
<FONT color="green">083</FONT>        public String apply(<a name="line.83"></a>
<FONT color="green">084</FONT>            String elementName, String attributeName, String value) {<a name="line.84"></a>
<FONT color="green">085</FONT>          int n = value.length();<a name="line.85"></a>
<FONT color="green">086</FONT>          if (n == 0) { return null; }<a name="line.86"></a>
<FONT color="green">087</FONT>          for (int i = 0; i &lt; n; ++i) {<a name="line.87"></a>
<FONT color="green">088</FONT>            char ch = value.charAt(i);<a name="line.88"></a>
<FONT color="green">089</FONT>            if (ch == '.') {<a name="line.89"></a>
<FONT color="green">090</FONT>              if (i == 0) { return null; }<a name="line.90"></a>
<FONT color="green">091</FONT>              return value.substring(0, i);  // truncate to integer.<a name="line.91"></a>
<FONT color="green">092</FONT>            } else if (!('0' &lt;= ch &amp;&amp; ch &lt;= '9')) {<a name="line.92"></a>
<FONT color="green">093</FONT>              return null;<a name="line.93"></a>
<FONT color="green">094</FONT>            }<a name="line.94"></a>
<FONT color="green">095</FONT>          }<a name="line.95"></a>
<FONT color="green">096</FONT>          return value;<a name="line.96"></a>
<FONT color="green">097</FONT>        }<a name="line.97"></a>
<FONT color="green">098</FONT>      };<a name="line.98"></a>
<FONT color="green">099</FONT>    <a name="line.99"></a>
<FONT color="green">100</FONT>      /**<a name="line.100"></a>
<FONT color="green">101</FONT>       * Allows {@code &lt;img&gt;} elements from HTTP, HTTPS, and relative sources.<a name="line.101"></a>
<FONT color="green">102</FONT>       */<a name="line.102"></a>
<FONT color="green">103</FONT>      public static final PolicyFactory IMAGES = new HtmlPolicyBuilder()<a name="line.103"></a>
<FONT color="green">104</FONT>          .allowUrlProtocols("http", "https").allowElements("img")<a name="line.104"></a>
<FONT color="green">105</FONT>          .allowAttributes("alt", "src").onElements("img")<a name="line.105"></a>
<FONT color="green">106</FONT>          .allowAttributes("border", "height", "width").matching(INTEGER)<a name="line.106"></a>
<FONT color="green">107</FONT>              .onElements("img")<a name="line.107"></a>
<FONT color="green">108</FONT>          .toFactory();<a name="line.108"></a>
<FONT color="green">109</FONT>    <a name="line.109"></a>
<FONT color="green">110</FONT>      private Sanitizers() {<a name="line.110"></a>
<FONT color="green">111</FONT>        // Uninstantiable.<a name="line.111"></a>
<FONT color="green">112</FONT>      }<a name="line.112"></a>
<FONT color="green">113</FONT>    }<a name="line.113"></a>




























































</PRE>
</BODY>
</HTML>
